FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term 1,4-alpha-glucan branching enzyme activity ID (Ontology) GO:0003844 (Gene Ontology)
Definition Catalysis of the transfer of a segment of a (1->4)-alpha-D-glucan chain to a primary hydroxyl group in a similar glucan chain.[ EC:2 ]
Also Known As"1,4-alpha-D-glucan:1,4-alpha-D-glucan 6-alpha-D-(1,4-alpha-D-glucano)-transferase activity" ; "1,4-glucan-6-(1,4-glucano)-transferase activity"
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Data ClassFieldDirect annotations
Genes (FBgn)GO_MOLECULAR_FUNCTION
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 1,4-alpha-glucan branching enzyme activity (all annotations which use CV term, excluding "NOT" statements)
     enables | 1,4-alpha-glucan branching enzyme activity
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  glycosyltransferase activity
   |__hexosyltransferase activity
       |__1,4-alpha-glucan branching enzyme activity  1 rec.
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Is a hexosyltransferase activity
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Synonyms
  • "1,4-alpha-D-glucan:1,4-alpha-D-glucan 6-alpha-D-(1,4-alpha-D-glucano)-transferase activity" EXACT
    "1,4-glucan-6-(1,4-glucano)-transferase activity" EXACT
    "alpha-1,4-glucan:alpha-1,4-glucan-6-glycosyltransferase activity" RELATED[ EC:2 ]
    "alpha-glucan-branching glycosyltransferase activity" RELATED[ EC:2 ]
    "amylo-(1,4 to 1,6)transglucosidase activity" RELATED[ EC:2 ]
    "amylo-(1,4->1,6)-transglycosylase activity" RELATED[ EC:2 ]
    "amylose isomerase activity" RELATED[ EC:2 ]
    "branching enzyme activity" RELATED[ EC:2 ]
    "branching glycosyltransferase activity" RELATED[ EC:2 ]
    "enzymatic branching factor" RELATED[ EC:2 ]
    "enzyme Q" RELATED[ EC:2 ]
    "glucosan transglycosylase activity" RELATED[ EC:2 ]
    "glycogen branching enzyme activity" RELATED[ EC:2 ]
    "plant branching enzyme" RELATED[ EC:2 ]
    "Q-enzyme" RELATED[ EC:2 ]
    "starch branching enzyme" RELATED[ EC:2 ]
Secondary IDs
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EC:2.4.1.18
MetaCyc:GLYCOGEN-BRANCH-RXN
MetaCyc:RXN-7669
Reactome:R-HSA-3322005 "GBE1 catalyzes branch formation in polyGlc-GYG1 complexed with GYS1-a"
Reactome:R-HSA-3322016 "GBE1 catalyzes branch formation in polyGlc-GYG2 complexed with GYS2-a"
Reactome:R-HSA-3322057 "GBE1 catalyzes branch formation in polyGlc-GYG1 complexed with GYS1-b"
Reactome:R-HSA-3878762 "Defective GBE1 does not catalyze branch formation in growing glycogen chains (liver)"